Headphone microphone boom



FIG. 1 is a top perspective view of a headphone microphone boom in accordance with the present invention;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the figures show portions of the headphone microphone boom or environment that form no part of the claimed design. 

CLAIM The ornamental design for a headphone microphone boom, as shown and described. 